Balanced valve



(No Model.)

M. M. SANDERS. BALANCED VALVE.

No. 267,802. Patented Nov. 21, 1882.v

. Plwta-Lilhogmpher. Washingkon. n. c.

UNITED STATES PATENT OFFICE.

MERVIN SANDERS, OF ALPENA, MICHIGAN.

BALANCED VALVE.

SPECIFICATION forming part of Letters Patent No. 267,802, dated November 21, 1882.

' Application filed August 10, 1882. (a. model.)

To all whom it may concern:

Be it known that I, MERVIN M. SANDERS, of Alpena, in the county of Alpena and State of Michigan, have invented new and useful Improvements in Balanced .Valves; and I do hereby declare that the following is a full, clear, and exact description thereof, reference beinghad to the accompanyingdrawings,which form a part of this specification.

The nature of this invention relates to certain new and useful improvements in balanced valves for steam purposes; and the invention consists in the peculiar construction, combinations, and operation of parts, as more fully hereinafter described.

Figure 1 is a longitudinal vertical central section of a steam-chest with my cylinder attachment. Fig. 2 is a vertical central crosssection. Fig.3 is a view ot'the piston-valve and intermediate connections, with the cylinder and steam-chest removed.

In the accompanying drawings, A represents the steam-chest of a steam-engine, in the bottom of which, are the usual inlet-ports a. B is the valve, operated in the usual manner by the valve-stem d. Instead of weighting the valve or holding it in place by the action of springs between the top of the valve and the steam-chest cover, I pivotal] y secure to the top of such valve a pair of links, (J, the upper ends of which are pivotally connected to a crosshead, 1), or rod, which passes through said links and the head of the piston-rod E, the outer ends of this rod D being provided with friction-rollers c. These links project through a circular openingin the chest-cover F. This opening is of slightly-larger diameter than the bore of the cylinder G, which is properly secured to the cover. Within this cylinder is the piston H, which is constructed in the usual way, with metal rings or other suitable packing, in order to compel it to fit and fill the interior of the, cylinder. On the two opposite sides of this cylinder are the grooved ways d, into which, when the parts are in place, the friction-rollers 0 enter, and, while they allow a sufficient vertical movement on the cross-head, they act as guides in the reciprocating movement of the piston, the area of which, to produce the best and most satisfactory results, should be the same as the top of the valve. The cylinder is provided with a head, I, secured in the usual manner, and in this head there is placed a valve or cock, f, for the purposes hereinafter described. The nearer the area of the piston and valve approximate the more perfect will be the balance, and the more perfect this balance the greater the ease with which the valve may be worked.

The steam-chest being filled with steam, the pressure will be both ways-to wit, upon the valve in one direction and upon the piston in the other-whilehetween the opposite head of the piston and the head of the cylinder nothing but atmospheric pressure will be found. Should, by any accident, the piston leak, so as allow steam to pass into the outer end of the cylinder, whereby a vacuum would be created at that point, the cockfshould be opened.

What I claim as my invention is- 1. In a balanced valve, and in combination with the valve, steam-chest, and piston, a cylinder formed in the said steam-chest and a piston operating therein, said piston being loosely connected to the valve and having friction-rollers to receive the side-thrusts due to the motion of the valve, as set forth.

2. In combination with the steam-chest A and valve B, the cylinder G, having cockf, the piston H, links 0, shaft D, and friction-rollers c, as and for the purposes set forth.

ME RVIN M. SANDERS.

Witnesses:

G. B.- GREELY, JOHN L. KELLY. 

